Airtight sealing of nozzle

ABSTRACT

Devices and methods for reliably and reusably creating an airtight seal on a tapered nozzle attached to a container of air-curable material. The device is a unitary expandable tube with an open end and a closed end filled with putty-like material. In one embodiment the device is placed over the nozzle, the device and nozzle are pushed together until the open end of the device flares around the outside diameter of the nozzle, and the nozzle tip displaces some the putty-like material thereby expanding the closed end of the tube to accommodate the displaced material.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates generally to devices and methods for creating an airtight seal on an opened container with a dispensing nozzle filled with a material, such as caulk or glue, that is susceptible to hardening upon exposure to air.

2. Description of Related Art

There exists an on-going need for a device that will reliably create an airtight seal on caulking tubes, containers of glue, or other containers using a nozzle to dispense materials susceptible to hardening upon contact with air. In addition, there is a need for a sealing device assist in keeping the work area clean by preventing leakage of the air-curable material during rest times. It is important that the device be cost-effective and reusable so that the operator may repeatedly use, for example, a caulking tube. If the device is not reusable then the cost of repeatedly replacing the sealing device will be greater than the cost of replacing the caulking tube, or other air-curable material.

There are many, many patents that teach various versions of sticking an object into the nozzle orifice, and thereby attempting to create an airtight seal. Other sealing devices are various versions of caps that cover the nozzle and orifice. The quantity of these patents indicates the difficulty in reliably creating a cost-effective airtight seal.

The sealing devices in the prior art tend to be of rigid construction. Problems arise with rigid devices because both the nozzle and the orifice may have varying diameters. The rigid construction means that the sealing device must specifically sized to accommodate the individual nozzle. Similarly, jamming a hard object into the nozzle orifice tends to distort the orifice, making subsequent attempts to create an airtight seal difficult or impossible, and also causes distortion of the bead when dispensing the air-curable material. Rigid devices are also susceptible to breaking.

In addition, existing sealing devices are often bulky in relation to the nozzle, and may be easily displaced. Even if the air-curable material does not harden during the time the sealing device is displaced, the air-curable material may leak all over the work area. This generates additional work for the operator, who must clean up the area where the leak occurred.

BRIEF SUMMARY OF THE INVENTION

Caulk, glue, and other air-curable substances are commonly dispensed from a container through an attached, tapered nozzle. Frequently, there remains caulk or other air-curable substance left in a container after initial use. The sealing device is inserted over the nozzle to prevent air from reaching the air-curable substance and thereby hardening the substance. The sealing device will also prevent leakage of caulking material, or other material, during rest times at work.

In one embodiment, the sealing device is a tight-fitting, flexible, expandable unitary body with an open end and a closed end. The closed end is filled with a moldable, putty-like material that is not air-curable. The diameter of the open end of the sealing device is smaller than a the widest outer diameter of the tapered nozzle attached to the container of air-curable substance. Because the sealing device is flexible it will stretch and flare to accommodate the outer diameter of the nozzle, and it will not distort either the orifice or the nozzle itself.

In addition, the flexible, unitary body prevents breakage of the device. There are no projections or parts that can break off, and the flexibility means that the device will not break if dropped or hit.

In one method of using the device the operator places the sealing device over the nozzle containing an orifice, and pushes the sealing device and nozzle together until the open end of the sealing device is flared and completely filled with the nozzle. In most cases, the sealing device is pushed over the nozzle until the nozzle tip is touching the cavity formed by the inside of the closed end of the sealing device.

In doing this, the nozzle will press into the moldable material and will displace some of the moldable material. Some of the moldable material will enter the nozzle orifice and create a plug at the orifice. The rest of the moldable material will exert pressure on the expandable unitary body, causing it to expand to accommodate the nozzle and displaced moldable material. Because of the expandable nature of the unitary body, the moldable material is unlikely to exit from the open end of the unitary body. This also displaces all, or essentially all, of the air in the sealing device. Thus, within the sealing device, the nozzle is entirely surrounded by the moldable material.

The sealing device has a low profile relative to the nozzle. This, along with the tight fit and flaring of the open end of the device, makes it virtually impossible to accidentally knock off the device. The flexible, expandable nature of the sealing device accompanied by the moldable material results in a sealing device that may be used over and over, on varying nozzle sizes. In addition, the sealing device may be re-filled with moldable material, if necessary.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS

FIG. 1 is a perspective side-view of one embodiment of the invention.

FIG. 2 is a perspective side-view of one embodiment of the invention.

FIG. 3 is a cut-away side-view of one embodiment of the invention.

FIG. 4 is a sectional and cut-away side-view of one embodiment of the invention in use.

FIG. 5 is a diagram of a method of using an embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIGS. 1 and 2, the sealing device 10 has a flexible, unitary body 11 generally in the shape of a tube with an open end 12 and a closed end 14. The body has an inner surface 16 and an outer surface 18. Inner surface 16 is smooth yet capable of frictionally engaging with a nozzle 30.

Unitary body 11 may be made from any variety of materials that are flexible, expandable and sufficiently strong to withstand repeated use. Non-limiting examples of such strong and expandable materials are rubber, silicone, flexible plastic, vinyl, ethylene propylene diene monomer rubber, or any other material that is durable, flexible and capable of expanding.

Outer surface 18 may have any variety of grips, indentions or texture 20 to facilitate grasping the sealing device and applying pressure to place the device on, or remove the device from, nozzle 30. In one embodiment, outer surface 18 has at least one grip 20 in the shape of a raised band, and may have as many raised grips 20 as desired. In another embodiment, at least one, or a multitude of small bumps covers outer surface 18.

In one embodiment, the sealing device has a central width 22. Unitary body 11 tapers from central width 22 toward closed end 14, and similarly tapers from central width 22 toward open end 12. In one embodiment, there is a concave dip, or concavity between central width 22 and open end 12, as shown in FIGS. 1 and 2. This dip helps the device cling to the nozzle.

The placement of central width 22 may be varied, as desired. It need not be in the exact middle of open end 12 and closed end 14, and may be placed anywhere between open end 12 and closed end 14.

The sealing device is operated by inserting the device over a tapered nozzle 30 containing an orifice 32. Nozzle 30 has a first end 34 and a second end 36 connected to container 40 containing air-curable material 42. Nozzle 30 tapers from second end 36 to first end 34, resulting in first end 34 being narrower than second end 36. Thus, the outer circumference 34 a of first end 34 is smaller than the outer circumference 36 a of second end 36.

Open end 12 of sealing device 10 defines an opening 13. Opening 13 may be any size that is larger than outer circumference 34 a and smaller than outer circumference 36 a of the nozzle 30. Outer circumference 31 is a circumference located between outer circumference 34 a and outer circumference 36 a.

Opening 13 and inner surface 16 are smooth, with no projections or extrusions. This allows opening 13 and inner surface 16 to fit snugly around outer circumference 31 of nozzle 30. This snug contact between nozzle 30 and inner surface 16 assists in creating and maintaining an airtight seal.

Closed end 14 defines cavity 17 at the closed end of the sealing device 10. Cavity 17 is filled with moldable material 24. Moldable material 24 may be any material known in the art that is pliable and is not susceptible to hardening upon contact with air. Non-limiting examples of such moldable materials are oil-based waxes, bee's wax, putty, plasticized metallocene-catalyzed propylene copolymers, or any other substance that remains pliable and moldable upon exposure to air.

To apply air-curable material 42, the operator cuts off the tip of first end 34 of nozzle 30 creating orifice 32, and exerts pressure on container 40 to expel air-curable material 42. When a quantity of air-curable material 42 remains in container 40 after the initial use the operator may use the sealing device to create an airtight seal.

The operator grasps the sealing device and places it over first end 34 of nozzle 30. The operator moves the sealing device and nozzle together, until the full diameter of opening 13 is in continuous contact with the full diameter of outer diameter 31 at a location between first end 34 and second end 36.

The operator continues moving the sealing device and nozzle 30 together. Because second end 36 is wider than first end 34, as sealing device 10 and nozzle 30 are moved together, opening 13 will flare around outer circumference 31. This flaring will cause open end 12 to grip nozzle 30, preventing sealing device 10 from being dislodged. The flexible nature of the sealing device allows open end 12 and opening 13 to expand around outer diameter 31 and to accommodate a variety of nozzle sizes. The flexibility of the sealing device will compensate for minor imperfections in the outer diameter 31 of nozzle 30. In addition, the flexible nature of sealing device 10 will not cause deformities in either nozzle 30 or orifice 13.

The sealing device contains moldable material 24 in cavity 17. As the operator inserts nozzle 30 into sealing device 10, orifice 32 will come in contact with moldable material 24, and will displace air and possibly some of moldable material 24. In one embodiment, first end 34 containing orifice 32 will penetrate moldable material 24, causing a small plug 25 of moldable material 42 to enter orifice 32. This small plug 25 creates a barrier, preventing additional air from reaching air-curable material 42.

The operator pushes the sealing device onto the nozzle as far as desired. In one embodiment, the operator will push the sealing device onto the nozzle until narrow end 34 rests against cavity 17. In another embodiment the nozzle does not rest against cavity 17. This action will displace all, or essentially all, of the air that was inside the sealing device. If desired by the operator, the operator may squeeze closed end 14 to dispel any air remaining inside sealing device 10.

At the same time, none or almost none of moldable material 24 will escape once the continuous connection between opening 13 and outer diameter 31 is established.

Increasing amounts of moldable material 24 are displaced as the operator continues to move the sealing device 10 and nozzle 30 together. In this situation, the expandable nature of sealing device 10 allows closed end 14 to expand to accommodate the displaced moldable material 24 and any remaining air, as shown in FIG. 4.

At this point the container with air-curable material is sealed and can be put away, for either a long period of time, or for a short period of time. By way of non-limiting example, a worker may use a caulking gun to caulk a seam. The caulking gun exerts pressure on the caulk tube to expel the air-curable material, in this case, the caulk. Typically, the operator will pause and put the caulk gun down after making a caulk bead to wipe the bead. Because of the pressure exerted by the caulking gun, caulk will drip from nozzle 30 during this time. The sealing device 10 may be quickly and easily placed over nozzle 30 to prevent leakage of air-curable material 42 during this time. Similarly, sealing device 10 may be used to prevent leaks during a rest break, a lunch break of any other time that the caulking gun, or other dispenser of air-curable material, is not being used. Thus, even if air-curable material 42 will not harden during a short break, sealing device 10 may be used to keep the work area clean and free from leaks and spills.

The next time the operator needs to use air-curable material 42 the operator simply grasps sealing device 10 and removes it from nozzle 30. The small plug 25 of moldable material 24 may remain inside orifice 32. The operator dispenses a small amount of air-curable material, generally by applying pressure to container 40, and this expels plug 25. The operator can then apply air-curable material 42, as desired.

After applying air-curable material 42, the sealing device 10 may be reused, by re-inserting nozzle 30 into sealing device 10, as described above. Sealing device 10 may be reused as many times as needed. Because a small amount of moldable material 24 may be lost when plug 25 is expelled, each use of sealing device 10 may result in a decrease in the amount of moldable material 24. After multiple uses the operator may re-fill cavity 17 with additional moldable material 24, as needed.

Sealing device 10 is flexible and relatively soft in relation to nozzle 30. Similarly moldable material 42 is softer than nozzle 30. Thus, nozzle 30 and orifice 32 will not be deformed by inserting sealing device 10 onto nozzle 30. Orifice 32 will retain the shape it had when the operator first removed tip 34. Because the sealing device does not deform orifice 32 or nozzle 34 the bead will not be deformed by use of the sealing device. Thus, the bead laid down upon subsequent uses will be identical to the original bead.

Various changes and modification to the invention will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the spirit and scope of the present invention. The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive, and the scope of the invention is as stated in the claims rather than by the foregoing description. All changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein. 

1. A sealing device for creating an airtight seal on a tapered nozzle with a first end containing an orifice, a second end connected with a container of air curable material, and an outer diameter located between said first end and said second end, comprising: an expandable unitary body with an open end defining an opening, a closed end defining a cavity, an inner surface and an outer surface, said inner surface of said unitary body being smooth and capable of flaring to frictionally engage with said outer diameter of said nozzle, said outer surface of the unitary body having texture, said opening in the open end being no larger than said outer diameter of the nozzle, and a pliable, non-air-curable material in said cavity of said closed end.
 2. The device of claim 1 wherein said expandable unitary body is made from a material selected from the group consisting of rubber, silicone, flexible plastic, vinyl, and ethylene propylene diene monomer rubber.
 3. The device of claim 1 wherein said pliable, non-air-curable material is made from a material selected from the group consisting of oil-based wax, bee's wax, putty, and plasticized metallocene-catalyzed propylene copolymers.
 4. The device of claim 1 wherein said texture is at least one raised grip.
 5. The device of claim 1 wherein said texture is at least one indentation.
 6. The device of claim 1 wherein said texture is at least one bump.
 7. The device of claim 1 wherein said outer surface contains a central width, and tapers from said central width toward said closed end, and tapers from said central width toward said open end.
 8. The device of claim 7 wherein said taper from said central width toward said open end includes a concavity.
 9. A sealing device for creating an airtight seal on a tapered nozzle with a first end containing an orifice, a second end, and an outer diameter located between said first end and said second end, comprising: an expandable unitary body with an open end defining an opening, a closed end defining a cavity, an inner surface and an outer surface, wherein said expandable unitary body is made form a material selected from the group consisting of rubber, silicone, flexible plastic, vinyl, and ethylene propylene diene monomer rubber, said inner surface of said unitary body being smooth and capable of flaring to frictionally engage with said outer diameter of said nozzle, said outer surface of the unitary body having texture, wherein said texture is selected from the group consisting of at least one raised grip, at least one indentation, and at least one bump, said outer surface containing a central width that tapers toward said closed end, and tapers from said central width toward said open end through a concavity, said opening in said open end being no larger than said outer diameter, and a pliable, non-air-curable material in said cavity at the closed end, wherein said pliable material is selected from the group consisting of oil-based wax, bee's wax, putty, and plasticized metallocene-catalyzed propylene copolymers.
 10. A method of creating an airtight seal on a tapered nozzle with a first end with an orifice, and a second end connected with a container of air-curable material susceptible to hardening upon exposure to air, and an outer diameter located between said first end and said second end, by using an expandable unitary body wherein said unitary body has a closed end defining a cavity filled with a pliable, non-air-curable material, an open end defining an opening that is no larger than said outer diameter of said nozzle, and an inner surface that is smooth, comprising: (a) inserting said nozzle into said opening of said unitary body sufficiently far so that said outer diameter of said nozzle is in continuous connection with said opening of said unitary body, (b) further inserting said nozzle into said opening until said opening flares around said outer diameter, and (c) further inserting said nozzle into said opening until said first nozzle end containing said orifice connects with and displaces some of said pliable material, forming a plug of pliable material in said orifice, and expanding said closed end of said unitary body due to the pressure from said displaced pliable material.
 11. The method of claim 10 further comprising: (d) inserting said nozzle into said unitary body sufficiently far so that said cavity of said unitary body is touching said first end of said nozzle.
 12. The method of claim 10 further comprising: (e) inserting said nozzle into said unitary body sufficiently far so that said cavity of said unitary body in not touching said first end of said nozzle.
 13. The method of claim 10 further comprising: (f) removing said unitary body from said nozzle; (g) dispensing said plug by applying pressure to said container; (h) dispensing said air-curable material as needed by applying pressure to said container; (i) repeating steps (a), (b), (c), (f), (g) and (h) as often as necessary.
 14. The method of claim 10 further comprising: (i) squeezing said closed end to displace any air remaining inside said body. 